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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

Safeguarding one of the world’s most vital staple foods was at the heart of the inaugural lecture delivered by Prof Botma Visser, Professor in the Department of Plant Sciences at the University of the Free State (UFS), on Wednesday 3 September 2025. Prof Visser shared insights from nearly two decades of research into wheat rust – a devastating crop disease that threatens both South Africa’s harvests and global food security.

“Wheat production in South Africa is threatened by three fungal pathogens that cause rust disease on the crop. Understanding the factors that contribute to virulence on locally grown cultivars is crucial to ensure continued wheat production,” said Prof Visser.

The fight against evolving wheat rusts

For the past 17 years, Prof Visser’s research has focused on the genetic structure of rust populations and the risks they pose to food security. His work has shown that these populations are dynamic and constantly changing due to genetic mutations within existing races, as well as the introduction of new races into South Africa.

“Computer modelling showed that rust can spread over vast distances by prevailing winds. During the 20th Century, at least four Southern African stem rust races managed to move across the Indian Ocean from Southern Africa to Australia. South Africa, in turn, received multiple new races from mid-Africa across Zambia and Zimbabwe, without any means of stopping these introductions,” he explained.

To respond to this challenge, his team recently implemented MARPLE (Mobile And Real-time Plant disEase) diagnostics using fourth-generation nanopore sequencing technology. This approach allows the rapid characterisation of fungal isolates, specifically targeting genes linked to fungicide resistance and virulence.

“This work,” Prof Visser noted, “is part of an effort to safeguard global wheat production.”

His research is a collaborative effort with Prof Willem Boshoff (Department of Plant Sciences, UFS) and Dr Tarekegn Terefe (Agricultural Research Council – Small Grain, Bethlehem). Together, their work has positioned the UFS as an internationally recognised centre of excellence in wheat rust research.

About Prof Botma Visser

Prof Botma Visser obtained his BSc in Botany and Microbiology (1988), BSc Honours in Microbiology (1989), and MSc in Botany (1993) at the University of the Free State, where he also completed his PhD in Botany in 2004.

His career spans more than 18 years of research into wheat rust pathogens, combining annual surveys, race pathotyping, molecular genetics, and cutting-edge sequencing technologies. His expertise has not only advanced understanding of rust population dynamics in South Africa but also contributed to global collaborative studies on crop disease.

News Archive

Official opening: UFS earmarks R10-million to support national priorities

2006-02-06

The University of the Free State (UFS) is to align key areas of its academic and research efforts with national priorities through the introduction of five strategic clusters which would be funded by seedmoney of R10-million in 2006.

Speaking at the Official Opening of the UFS on Friday (3 February 2006), the Rector and Vice-Chancellor, Prof Frederick Fourie, said the academic and research work that will be done in the five strategic clusters would contribute to the development of Mangaung, the Free State, South Africa and Africa.

“It makes sense to concentrate the university’s human resources, our infrastructure, financial resources and intellectual expertise to ensure that the UFS makes a contribution to the country and the African continent,” Prof Fourie said.

“Strategic clusters will be organised on the basis that these areas of knowledge could become in the short term the flagships of the UFS, meaning those areas where the university currently has or in the very near future is likely to have some competitive advantage,” Prof Fourie said.

According to Prof Fourie, this strategic-cluster approach will be in line with the approach being designed by the National Research Foundation (NRF) to take national priorities into account and would enhance the quality of scholarship at the UFS.

The five strategic areas in which research and academic investment at the UFS will be clustered are the following:

Enabling technologies / Technology for the future;
Food production, quality and food security for Africa;
Development;
Social transformation;
Water resource and ecosystem management;

“Such strategic clusters are understood not only as research areas but as areas that also encompass strong undergraduate and particularly postgraduate teaching and a potentially solid scientific basis for service learning and community service research,” Prof Fourie said.

Within each of these clusters specific niche areas will be identified. Clusters could focus on one or more aspects of a particular discipline or could involve more than one discipline in researching a particular issue.

He said not all academic work and research being done at the UFS would be clustered in this way. Sufficient resources and support have been put in place for general research excellence in the past five years.

“Some of the spin-offs can have an important impact on industrial development, for example in the chemicals industry and may also create a basis for cooperation with provincial, national and international partners,” he said.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
5 February 2006

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